The difference between Certainly and Sure

When used as adverbs, certainly means in a way which is certain, whereas sure means without doubt, certainly.

Sure is also interjection with the meaning: yes.

Sure is also adjective with the meaning: physically secure and certain, non-failing, reliable.

check bellow for the other definitions of Certainly and Sure

  1. Certainly as an adverb:

    In a way which is certain; with certainty.

  2. Certainly as an adverb:

    Without doubt, surely.

    Examples:

    "The accident was certainly caused by human error."

    "That was certainly sweet of him."

    "You may certainly join us for dinner."

  3. Certainly as an adverb:

    An emphatic affirmative answer; of course.

    Examples:

    "Would you like it with ice?  Certainly, and with lemon please."

  1. Sure as an adjective:

    Physically secure and certain, non-failing, reliable.

    Examples:

    "This investment is a sure thing. The bailiff had a sure grip on the prisoner's arm."

  2. Sure as an adjective:

    Certain in one's knowledge or belief.

    Examples:

    "He was sure she was lying. I am sure of my eventual death. John was acting sure of himself but in truth had doubts."

  3. Sure as an adjective:

    Certain to act or be a specified way.

    Examples:

    "Be sure to lock the door when you leave."

  4. Sure as an adjective (obsolete):

    Free from danger; safe; secure.

  5. Sure as an adjective (obsolete):

    Betrothed; engaged to marry.

  1. Sure as an adverb (modal adverb):

    Without doubt, certainly.

    Examples:

    "Sure he's coming! Why wouldn't he?"

    "Did you kill that bear yourself? ―"I sure did!"

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